模拟大气CO_2浓度和温度升高对亚高山冷杉(Abies faxoniana)林土壤酶活性的影响  

Effects of simulated elevated atmospheric CO_2 concentration and temperature on soil enzyme activity in the subalpine fir forest

作　　者：冯瑞芳[1] 杨万勤[1] 张健[1] 邓仁菊[1] 简毅[1] 林静[1] 

机构地区：[1]四川农业大学林学园艺学院,四川雅安625014

出　　处：《生态学报》2007年第10期4019-4026,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30471378);国家"十一五"重大科技支撑计划课题资助项目(2006BAC01A11);四川省青年科技基金资助资助项目(07JQ0081);四川省重大应用基础研究计划和四川农业大学人才引进资助项目~~

摘　　要：采用控制环境生长室研究了川西亚高山森林生态系统中与C、N、P循环有关的土壤转化酶、脲酶、硝酸还原酶和酸性磷酸酶活性的月动态及其对模拟大气CO2浓度增加、温度升高以及交互作用的动态响应。在一个生长季节内,土壤有机层和矿质土壤层的转化酶、脲酶、硝酸还原酶和酸性磷酸酶的活性高峰均出现在温度较高的夏季。其中,土壤有机层的转化酶活性高峰出现在6月份,但土壤矿质层的转化酶活性高峰出现在7月份,土壤有机层和矿质土壤层的脲酶和酸性磷酸酶的活性高峰均出现在7月份,而硝酸还原酶的活性高峰均出现在8月份。升高大气CO2浓度处理(EC)对土壤有机层和矿质土壤层的转化酶、脲酶、硝酸还原酶和酸性磷酸酶活性没有显著影响。升高温度处理(ET)显著增加了土壤有机层和矿质土壤层的酶活性,并且土壤有机层的转化酶、硝酸还原酶和脲酶活性增加更显著。大气CO2浓度增加和温度升高之间的交互作用(ECT)对土壤有机层和矿质土壤层酶活性的影响主要是温度升高引起的。Global change has been concerned about worldwide since climate change characterized by global warming and atmospheric CO2 enrichment is changing the structure and function of terrestrial ecosystem. Meanwhile, numerous studies undertaken over the past decade have led to the general conclusion that enzymes in mineral soil and soil organic layer play a key role in the soil biochemical process and are closely related to the cycles of bioelements and energy fluxes in forest ecosystem. Therefore, understanding of soil enzyme activity responses to simulated atmospheric CO2 enrichment, elevated temperature and their interactions remain essential for predicting the changes in the high-frigid forest ecosystem function and structure in the future. Little is known about the responses of the activities of soil enzymes that are related to the cycles of carbon, nitrogen and phosphorus to simulated climate change, although numerous reports have been published on the responses of the forest structure and function to free atmospheric CO2 enrichment. Therefore, 72 intact soil columns from the primary fir （Abiesfaxoniana Rehder ＆ E. H. Wilson） forest were parked in the controlled environmental chamber, and the activities of invertase, urease, nitrate reductase and acid phosphatase, which are related to the cycles of organic carbon, nitrogen and phosphorus in mineral soil and organic layer under simulated atmospheric CO2 concentration increase （ （350 ～ 25） μmol·mol^-1） （EC）, elevated temperature （2.0℃～ 0.5℃ ） （ET） and their interaction （ECT） were measured simultaneously to understand the monthly variations on enzyme activities and their responses to climate change in the future. The significant monthly variations on the soil with the highest enzyme activities in regulate activities of the studied enzymes were observed summer, implying that monthly variation of soil the monthly patterns of soil enzyme activities in the subalpine forest. The highes in soil organic layer and mineral temperature wa

关 键 词：高寒森林 土壤有机层 大气CO2浓度增加 温度升高 土壤酶活性 

分 类 号：S714[农业科学—林学]